Denominator of b(n)-b(n+1), where b(n) = n/((n+1)(n+2)) = A026741/A045896.

Terms

a(0) =1a(1) =60a(2) =60a(3) =70a(4) =84a(5) =504a(6) =120a(7) =990a(8) =165a(9) =572a(10) =1092a(11) =2730a(12) =280a(13) =4080a(14) =2448a(15) =1938a(16) =855a(17) =7980a(18) =1540a(19) =10626a(20) =3036a(21) =4600a(22) =7800a(23) =17550a(24) =819a(25) =21924a(26) =12180a(27) =8990a(28) =7440a(29) =32736